The 9/11 plane crash on The World Trade Center was due to terrorist hacking the planes. The US was attacked because the terrorist thought that it would benefit them in a way. As a result the US used military force against Afghanistan in the wake of the 9/11 attacks because the Taliban government would not turn over Bin Laden.
Explanation:
I hope this helps, I learned some of the 9/11 attack when I was younger but now I'm in 11th grade so it was a while. Good Luck :)
